Nuel Belnap
University of Pittsburgh

"Branching time" (Prior 1967, Thomason 1970) models indeterminism, but
has no room for causal independence. "Branching space-times" (Synthese
1992) is a generalization that combines indeterminism and relativity, which
permits the representation of true causal independence via the notion of
"space-like relatedness." The question is whether the theory can be useful
in representing parallel processing.